Expansion shield



Feb. 19, 1929.

C. C. TOMKINSON EXPANSION SHIELD Filed Aug. 25. $921 2 Sheets-Sheet vgave/Aim, 2/17/65 C YUM/525022 Feb. 19, 1929. 1,702,920

C. C. TOMKINSON v EXPANSION SHIELD Filed Aug. 25, 1921 2 Sheets-Sheet 2(invents:

C'fiazzv fjamirz'nsan $513 Gum/mu,

Patented Feb. 19, 1929.

UNITED STATES v 1,702,920 PATENT OFFICE.

CHARLES C. TOMKINSON, OF PLAINFIELD, JERSEY, ASSIGNOR TO JOHN EDWARDOGDEN, OF MOUNTAINVILLE, NEW YORK.

EXPANSION SHIELD.

Application fil'ed August 25, 1921. Serial No. 495,315.

This invention relates to expansionshields for bolt anchors such-as areused in walls of brick, stone or cementitious material.

Expansion shields used in bolt anchors in which the shield is expandedby a nut car ried by a bolt that bears directlyagainst the bottom of theshield are termed bottombearing shields. Tests of shields of this typehave established the fact that the success of the shield is largelydependent upon the strength of the bottom to resist the pressure of thebolt. When shields of this type are formed from sheet metal the thinnessandductility of the metal makes it necessary to reinforce the bottom insome manner to Withstand this thrust of the bolt.

This invention has for its object to provide means "for reinforcing thebottom or end of anexpansion shield.

tion proceeds.

Several. different forms of expansion shields having means for attainingthe objects of the invention have been illustrated in the drawings andfor convenience the different forms'may be roughly grouped as follows. I

The first group shown in Figs. 1 6 inclusive, comprises shields having aplurality of separate sections held together by suitable means such as asplit ring, each section having its inner end or bottom reinforced as byfolding or .corrugating the end or by'a separate reinforcing member- Thesecond group, shown in Figs. 7 -21 inclusive, comprises shields having aplurality of sections held together if. desired by a split ring andjoined at their inner ends by a slack connection which allows thesections'to expand freely at first but forms a bridge to sustain thebolt thrust after the slack has been taken up. i

The third group, shown in Figs. 22452 in elusive, comprises a shieldmade from asingle piece sheet metal blank with aconnectingbridge'bet-ween 'the expansion elements located at the inner end of theshield to take the thrust of the bolt. I Another form that Still anotherform falling in'this group com-,

prises sectional shields having their bottoms welded together.

inner.

, Further objects will appear as the descrip- If desired a thrustwashermay becombined with any of the three groups described as shown,for instance, in Figs. 5 and 6. 1

Referring nowspecifically to the figures of the drawings.

Fig. 1 1s a sectional elevation of one seetion of a shield constructedinaccordance with the invention.

Fig. 2 is anelevation of the structure 1 shown in Fig. 1, taken at rightangles thereto.

Fig. 3 is an end elevation of the shield comprising sections constructedas shown in- Figs. 1 and 2. v Figs. 4, 5 and 6 show another form of} thelnvention in which a separate thrust washer or disc is used to formathrust bearing.

Fig. ,7 is an elevation of another form of bolt anchor in whichtheshield is formed from a plurality of sections held together. at

the construction in which the sections are,

loosely connected by a cupped'member.

3 Figs. 12 and 13 are corresponding views of another form of theinvention in which the ends are bent outwardly and laterally and reeeive a disc or washer.

Figs. 14 and 15 are corresponding views of another form of the inventionin which the disc is disposed within instead of without the shield.

Figs. 16 and 17 are corresponding views of V another form oftheinvention in which each section has a member projecting from its endand extending into a slot formed in another section. 1'.

Figs. 18and 19 are corresponding views of another form of the inventionin which the ends of the sections overlapand are joined by a slackconnection. Figs. 20 and 21 are corresponding views of another form ofthe invention having outwardly projectingportions joined by a slackconnection. 7 p 22isan elevation of another form of "bolt anchorembodyingjmy invention and comprising a plurality of sections havingtheir inner or bottom ends tightly connected I together and reinforcedas by folding. In this form oi? the invention the shield is made from asingle piece sheet metal blank.

Fig. 23 is a sectional elevation of the shield. shown in- Fig.

Fig. 24 is an end elevation of the construction shown in Fig.

25 is an elevation of one of the sections ot' the shield shown in Fig.22.

Fig. 26 is aplan view of the blank -from which the shield shown in Figs.22, 28, 2d and 25 is constructed.

Fig. 27 is a sectional elevation of another form or shield constructedin accordance with my invention and comprising-a plurality of sectionshaving outwardly projecting overlapping portions.

Fig. 28 is an end shown in Fig. 27. c

Fig. 29 is a sectional elevation of another form of shield comprising aplurality of sections having connected outwardly projecting view of theconstruction I portions.

Fig. 30 is a new end view of the construction shown in Fig. 29.

Figs. 31 and 32 are sectional elevations of two different tormsotreinforcing discs that may be used in connection with the shields shownin the preceding figures.

In the form of the invention illustrated in Figs. 1 2' and 3 eachsect-ion 53 has its inner end folded back upon itself in the term of aletter S" as shown particularly in Fig. 6. These folded over portionsmaterially strengthen the bottom of the shield.

In the form of shield shown in Figs. Ah 5 and 6 the ends of the sectionsare bent inwardl'y toward the axis of the shield and a disc or washer 58positioned in the bottom of the shield".

The form of the invention shown in Fig. 7 falls within. the second groupin which the sections of the shield are held at one end by a split ring5 L but the opposite or inner ends of the sections are permitted to movelaterally a limited distance upon the initial expansion of the shield.The details of this slack connection are shown in Figs. 8 and 9' whereineach section is SllOWH as"provided with a slot 60'. A brid emember orstrip 61 is positioned within the bottom of the shield and has its endsextending through the slots and bent backwardly as shown at 62. When thenut used in connection with this shield begins to travel along the bolt50 the initial movement of the nut will cause the inner ends of thesections to move outwardly until the slack between the ends of themembers 6 1 and the shield sections is taken up. Thereafter the bridgemember 61 forms a firm andrigid abutment tor the bolt.

In Figs. 10 and 11 another slack connection between the shield sectionsis shown and in this form the inner ends of the sections are turnedinwardly as shown at 63, and a cup shaped member 64 encircles these endportions. The member 64 is indented as shown at 65- to strengthen themember and by this construction also a firm abutment tor the bolti-sformecl. 1

' In Figs. 1-2 andl3 the ends 66 oi the shield sections are bentlaterally outwardly and are then. bent away from the axis each endforming a U-shaped section. A washer 67 is placed over the laterallybent portions and is retained in place by the ends 68 of the sections.

The form ol shield shown in i l and 15 is simi-la-r'to that shown inFigs. 12 and 13 but diii ers in that the ends 69 ot' the shield are bentinwardly instead of outwardly.

In Figs. 16 and 17 each section of the shield is formed with anextension 70 the end of which is passed through a slot 71 in theadjacent section." The extreme ends of these portions 70 are bent backagainst the bottom ofthe shield.

In Figs. 18 and 19 the ends of the two sec 7 tions of theshi'eld overlapand one of them has formedtherein a slot 2 through which is passed anextension 73 formed on the other see lion.

In Figs. 20 and 21 one section is provided with an outwardly bent endportion 74 which is encircled by an overlappingportion 78 formed on theother section, these portions being loosely connected to provide slackand to be taken up upon the initial expansion.

In Figs. 22 to 26 inclusive a one piece sheet metal expansion shield isillustrated, the blank being shown in Fig. 26. In order to form thisshield the end portions 80' are folded about the central portion 81 andthe central portion is folded on the dotted lines thereby forming theoverlapping ends shown 21582 in Figs. 24 and 25. This construction issomewhat similar to that shown in Figs. 1, 2 and 3 but in the presentinstance the shield is formed from a single piece blank; The completedsh eld formed lirom this blank 1s shown. in Frg. 22;

27' and-28 illustrate a shield somewhat similar to that shown in Figs.20and 21 and in this instance the overlapping ends 85 formedf'on. onesection of the shield tightly enclose the outwardly projecting portion86 formed on the other section. v

In the shield shown in Figs. 29 and 30 each section has an outwardlyextending portion 87, these portions. being encircled. by a band 88. Theends of the portions 87 are flared outwardly as shown at 89 to retaintheband in place.

Fig. 31 shows a cup shaped reinforcing member which may be used inconjunction with any of the shields shown in the preceding'figures in amanner simllar to the Washer. 08 shown 1n Figs. 5 and 6.

Another form of reinforcing member; is

shown in Fig. 32, this member being cup shaped and having an indentedcentral portion further strengthening the thrust member.

Although several specific embodiments of the invention have beenillustrated and described, it will be understood that the invention iscapable of further modification and that further changes in theconstruction and in the arrangement of the various elements may be madewithout departing from the spirit. or scope of the invention asexpressed in the following claims.

- lVhat I claim is: V

1. An expansion shield comprising a plurality of sections, the innerends of the sections being slotted and reinforcing means extendingthrough the slots. 7

2. An expansion'shield comprising a plurality of sections, the innerends of the sections being sloted and reinforcing means within theshield extending through the slots.

3. An expansion shield comprising a plurality of sections, the innerends of the sec-' tions being slotted and reinforcing means having endsextending into the shield through the slots.

l. An expansion shield comprising a plurality of sections, the innerendof one of the sections being slotted and reinforcing means extendingthrough the slot.

5. An expansion shield having a. plurality of sections, the inner end'ofone of the sec tions being slotted and reinforcing means secured toanother section and extending through the slot.-

6. A sheet metal expansion shield expansible at its inner end,comprising a .plu ralityof sections laterally expansible into permanentgripping engagement with a wall opening and having its inner endclosedand separate reinforcing means for the closed end of the shield.

7. An expansion shield formed'of sheet metal and expansible at itsinner'end',.com-

prising a plurality of longitudinal laterally expansible sections havingtheir inner ends bent to form a closed end for the shield, and

separate means reinforcing said closed end. 8. A. sheet metal expansionshleld expansible atits inner end, comprising'aplurality of sectionslaterally expansllole into permanent gripp ng engagement with a wallopening and havmg its inner end closed and reinforcing means for theclosed end of the shield, sa1d relnforclng means extending acrossand'bridging the closedend and in uxtapos1t1on thereto.

9. In combination, an expansion shield having walls of uniformthickness, reinforcingmeans disposed across and bridging the inner endof the shield, an expansion mem ber in the shield adapted totravellongitudinallyv therein and expand the shield at its inner end anda threaded bolt engaging said member and adapted to move said memberlongitudinally in the shield, said bolt being adapted to contact withsaid reinforced end.

10. In combination, an expansion shield having walls .of uniformthickness and comprising a plurality of sections connected at theirinner ends by a reinforcing member, a nut in the shield adapted totravel longitudin ally in said shield and expand the shield and a boltthreaded into said nut and adapted to contact with said reinforcingmember. 11. A sheet metal expansion shield having walls of singlethickness and comprising a plurality of walls laterally expansible intopermanent gripping engagement with a wall opening and reinforcing andexpansion limiting means for the inner end of the shield.

12. An expansion shield having walls'of single thickness andsubstantially uniform in cross sectionthroughout their length,.said

walls being laterally expansible into permawardly bent ends. 1 Y

14. A sheet metal expansion shield comprising a plurality of sectionslaterally ex-v pa-nsible at the inner ends thereof into per-,

manent gripping engagement with a wall opening, the inner end of eachsection of the shield being bent inwardly toward the axis thereof, andreinforcing means disposed in the-inner end of the shield and extendingacross and bridging the inwardly bent inner j ends. I r I In witnesswhereof, I have hereunto set my hand this 12thday ofAugust,1921.

CHARLES C. TOMKINSON.

